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<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      async function main() {
        // 1.如果返回值是一个非Promise类型的数据
        // return 433;
        // 2.如果是以恶搞Promise对象
        let p = new Promise((res, rej) => {
          // res('433');
          rej('677');
        });
        // 3.抛出异常
        // throw 'ddd';

        //

        try {
          let res = await p;
          // console.log(res);
        } catch (error) {
          console.log(error);
        }
        // let res1 = await 20;
        // console.log(res1);
      }
      let res = main();
      console.log(res);
    </script>
  </body>
</html>
